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- W826151431 abstract "1. Intr oduction Steady state operation of a fusion device is one of key issues to develop an economically viable fusion power plant. This issue is more critical for the tokamak-based fusion power plant due to the inherent pulsed operation property of tokama ks. In this context, one of research objectives of the KSTAR tokamak is set to establish a steady state operation scenario as a step toward an attractive tokamak fusion reactor [1]. ITER also sets one of its goals to build up steady state operation scenarios with Q = 5 at reduced plasma current. The hybrid mode or reversed shear mode can be considered as strong candidates for the steady state operation scenario. It usually exhibits high bootstrap current owing to high plasma pressure compared with conventional ELMy H-modes. Together with external current drive, fully non-inductive current drive is achievable by this high fraction of bootstrap current. The very core of a subject in hybrid modes and reversed shear modes is how to produce and sustain a flat or reversed q-profile. Generally, these q-profiles are able to be formed by preheating in the plasma current ramp-up phase using external sources. The preheating in the plasma ramp-up phase increases the plasma conductivity and subsequent reduction of the diffusion of the Ohmic current into the centre of the plasma comes up with the flat or reversed q-profile. Apart from NBI (Neutral Beam Injection), ECH (Electron Cyclotron Heating) and LHCD (Lower Hybrid Current Drive), the effect of ICRH (Ion Cyclotron Resonance Heating) for the preheating has not been investigated systematically in tokamak devices. In this paper, predictive modelling of ramp-up scenarios with ICRH is performed using the ASTRA code [2] to investigate the effect of ICRH on the evolution of the q-profile during the current ramp-up phase at ASDEX Upgrade in preparation of KSTAR steady state operation scenario development." @default.
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- W826151431 date "2007-01-01" @default.
- W826151431 modified "2023-09-23" @default.
- W826151431 title "Modelling of ICRH-heated Ramp-up Phases at ASDEX Upgrade in KSTAR Experimental Conditions" @default.
- W826151431 hasPublicationYear "2007" @default.
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